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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 20, 2024
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Debt and Equity Securities, FV-NI [Line Items]          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount   $ 0.0   $ 0.0  
Income from equity-method investments   $ (0.1) $ (0.2) $ 0.8 $ 0.1
Proceeds from Dividends Received     $ 1.3   $ 1.3
9 Story Media Group Inc.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity method and other investments $ 0.9        
Total Children's Book Publishing and Distribution          
Debt and Equity Securities, FV-NI [Line Items]          
Equity method ownership percentage   26.20%   26.20%  
Financing and Production Company | Financing and Production Company          
Debt and Equity Securities, FV-NI [Line Items]          
Other equity percentage       4.60%  
UK Children's Book Publishing          
Debt and Equity Securities, FV-NI [Line Items]          
Other equity investments, percentage acquired 12.00%        
Animated Television Production Companies          
Debt and Equity Securities, FV-NI [Line Items]          
Equity method ownership percentage 50.00%